Aluminum alloy with cold heading cracking-free effect

Abstract

The invention discloses an aluminum alloy with a cold heading cracking-free effect. The aluminum alloy comprises the following components in percentage by weight: 0.43%-0.46% of Si, 0.82%-0.86% of Mg, 0.02%-0.04% of Sn and the balancing Al; an aluminum alloy bar serves as the aluminum; the temperature of the aluminum alloy bar is 510-525 DEG C; and the temperature of a discharging port during the processing of the aluminum alloy bar is 535-560 DEG C. Through the research and the adjustment of the components of the aluminum alloy, the contents of Si and Mg in the aluminum alloy bar can reach the lower limit as much as possible on the basis of the 6061 aluminum alloy national standard; meanwhile, the content of the rare element Sn is increased, so that the hardness of the aluminum alloy product can be slowly improved in the T3 state; through the cold heading forming of the aluminum alloy bar during the period, the product can be basically prevented from cracking; the aluminum alloy bar subjected to artificial aging is good in mechanical performance; the tensile strength is greater than or equal to 260 MPa, the yield strength is greater than or equal to 240 MPa, and the ductility is greater than or equal to 8%; and an automobile inflating valve prepared by adopting the aluminum alloy is high in product quality and long in service life.

Description

technical field [0001] The invention belongs to the field of aluminum alloys, in particular to an aluminum alloy with the effect of no cracking during cold heading. Background technique [0002] The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third, and it is also the most abundant metal element in the earth's crust, mainly existing in aluminosilicate ores. Among the metal varieties, aluminum metal is the second largest group of metals after steel. [0003] Aluminum alloy is a metal alloy material widely used at present. The aluminum alloy profiles made of it have various specifications and are widely used, and occupy a very important position in rolling production. At the same time, aluminum alloy is also the most widely used non-ferrous metal structural material in the industry. It is widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. At present, aluminum alloy is the most...

AI Technical Summary

Problems solved by technology

When aluminum alloy is used to produce automobile valves, it is generally formed by cold heading, but the applicant found that during the production process, when cold heading the traditional 6061 aluminum alloy bar, cracking is very easy to occur, and the scrap rate is about 50% , and this kind of defective product has the risk of flowing into the next process. In the actual use process, it is easy to cause the air valve of the car to leak, which has a very large impact on the quality of the product and the car.